fix(@angular-devkit/build-webpack): emit devserver setup errors

alan-agius4 · dgp1130 · commit 5682baee4b56 · 2022-04-11T11:46:54.000-07:00
Closes #22969 (cherry picked from commit 3afd1ab)
diff --git a/packages/angular_devkit/build_webpack/src/webpack-dev-server/index.ts b/packages/angular_devkit/build_webpack/src/webpack-dev-server/index.ts
@@ -82,7 +82,13 @@ export function runWebpackDevServer(
           });
 
           const devServer = createWebpackDevServer(webpackCompiler, devServerConfig);
-          devServer.startCallback(() => {
+          devServer.startCallback((err) => {
+            if (err) {
+              obs.error(err);
+
+              return;
+            }
+
             const address = devServer.server?.address();
             if (!address) {
               obs.error(new Error(`Dev-server address info is not defined.`));
